Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7377498 | Device in process engineering column | Emil Fehr, Bruno Keller, John Heggen | 2008-05-27 |
| 7287746 | Device in a process engineering column | Emil Fehr, Bruno Keller, John Heggen | 2007-10-30 |